“I have been trying to do some research on whether vaping THC oil made with coconut oil is safe, but found arguments for both sides. Some said it could cause lipid pneumonia, others said it was safe.”
I would definitely advise against it. The preparations that use methods of extraction that don’t require additional vehicles like coconut oil or propylene glycol are probably safer. It’s true that the lung doesn’t like oils at all, but there are also questions about what happens to these substances if vaporized at higher temperatures and concern this might create medically harmful polymers.